---
title: "ICD-10-CM I50.43: Acute on chronic combined systolic… | BillingBrief"
description: "ICD-10-CM code I50.43: Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure. Category, related codes, and the official…"
canonical: "https://billingbrief.com/icd10/i50.43/"
language: "en"
---

# I50.43 Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   cardiac arrest (I46.-)
-   neonatal cardiac failure (P29.0)

### Code first

Code the underlying condition first, then this code.

-   heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)
-   heart failure due to hypertension ([I11.0](https://billingbrief.com/icd10/i11.0/))
-   heart failure due to hypertension with chronic kidney disease (I13.-)
-   heart failure following surgery (I97.13-)
-   obstetric surgery and procedures (O75.4)
-   rheumatic heart failure (I09.81)

### Code also

A second code may be needed. Sequencing depends on the encounter.

-   end stage heart failure, if applicable ([I50.84](https://billingbrief.com/icd10/i50.84/))

## Related codes

-   [`I50.33` Acute on chronic diastolic (congestive) heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.33/)
-   [`I50.40` Unspecified combined systolic (congestive) and diastolic (congestive) heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.40/)
-   [`I50.41` Acute combined systolic (congestive) and diastolic (congestive) heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.41/)
-   [`I50.42` Chronic combined systolic (congestive) and diastolic (congestive) heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.42/)
-   [`I50.810` Right heart failure, unspecified ICD-10-CM](https://billingbrief.com/icd10/i50.810/)
-   [`I50.811` Acute right heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.811/)
-   [`I50.812` Chronic right heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.812/)
-   [`I50.813` Acute on chronic right heart failure ICD-10-CM](https://billingbrief.com/icd10/i50.813/)

## Common questions

### Is I50.43 a billable code?

Yes. I50.43 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

I50 Heart failure

Chapter

Diseases of the circulatory system

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).